"""
Query Executor Service

Handles query processing with intent detection, data querying, and response generation.
Uses semantic search for scalable dataset discovery and session-scoped layer storage.
"""

from backend.core.llm_gateway import LLMGateway
from backend.services.data_loader import get_data_loader
from backend.core.geo_engine import get_geo_engine
from backend.services.response_formatter import ResponseFormatter
from backend.core.session_store import get_session_store
from backend.core.semantic_search import get_semantic_search
from backend.core.data_catalog import get_data_catalog
from backend.core.query_planner import get_query_planner
from typing import List, Dict, Any, Optional
import json
import datetime
import uuid
import logging

logger = logging.getLogger(__name__)

# Default session ID for backward compatibility
DEFAULT_SESSION_ID = "default-session"


class QueryExecutor:
    def __init__(self):
        self.llm = LLMGateway()
        self.data_loader = get_data_loader()
        self.geo_engine = get_geo_engine()
        self.session_store = get_session_store()
        self.semantic_search = get_semantic_search()
        self.catalog = get_data_catalog()
        self.query_planner = get_query_planner()

    def _get_schema_context(self) -> str:
        """Returns the database schema for the LLM context."""
        return self.data_loader.get_schema_context()

    async def process_query_with_context(self, query: str, history: List[Dict[str, str]]) -> Dict[str, Any]:
        """
        Orchestrates the full query processing flow with conversation context.
        """
        # 1. Detect intent
        intent = await self.llm.detect_intent(query, history)
        print(f"[GeoQuery] Detected intent: {intent}")
        
        # 2. Route based on intent
        if intent == "GENERAL_CHAT":
            return await self._handle_general_chat(query, history)
        elif intent in ["DATA_QUERY", "MAP_REQUEST"]:
            # Always include map for data queries - the visual is helpful
            return await self._handle_data_query(query, history, include_map=True)
        elif intent == "SPATIAL_OP":
            return await self._handle_spatial_op(query, history)
        elif intent == "STAT_QUERY":
            return await self._handle_stat_query(query, history)
        else:
            return await self._handle_general_chat(query, history)

    async def process_query_stream(self, query: str, history: List[Dict[str, str]]):
        """
        Streamable version of process_query_with_context.
        Yields: {"event": "status"|"thought"|"chunk"|"result", "data": ...}
        """
        
        # 1. Intent Detection with Thoughts
        yield {"event": "status", "data": json.dumps({"status": "🧠 Understanding intent..."})}
        
        intent = "GENERAL_CHAT"
        intent_buffer = ""
        
        try:
            async for chunk in self.llm.stream_intent(query, history):
                if chunk["type"] == "thought":
                    yield {"event": "chunk", "data": json.dumps({"type": "thought", "content": chunk["text"]})}
                elif chunk["type"] == "content":
                    intent_buffer += chunk["text"]
        except Exception as e:
            print(f"Intent stream error: {e}")
        
        intent = intent_buffer.strip().upper()
        if not intent:
            intent = "GENERAL_CHAT" 
            
        # Clean up intent string
        for valid in ["GENERAL_CHAT", "DATA_QUERY", "MAP_REQUEST", "SPATIAL_OP", "STAT_QUERY"]:
             if valid in intent:
                 intent = valid
                 break
        
        yield {"event": "intent", "data": json.dumps({"intent": intent})}
        print(f"[GeoQuery] Detected intent: {intent}")

        if intent == "GENERAL_CHAT":
            async for chunk in self.llm.generate_response_stream(query, history):
                # Transform to frontend protocol
                if chunk.get("type") == "content":
                     yield {"event": "chunk", "data": json.dumps({"type": "text", "content": chunk.get("text")})}
                elif chunk.get("type") == "thought":
                     yield {"event": "chunk", "data": json.dumps({"type": "thought", "content": chunk.get("content")})}
            
            # Send final result to clear loading status
            yield {"event": "result", "data": json.dumps({"response": ""})}
            return

        # Handle Data/Map/Stat Queries together via a unified stream handler
        
        if intent in ["DATA_QUERY", "MAP_REQUEST", "STAT_QUERY"]:
            include_map = intent != "STAT_QUERY"
            session_id = DEFAULT_SESSION_ID  # TODO: Get from request context
            
            # 0. Check query complexity
            complexity = self.query_planner.detect_complexity(query)
            
            if complexity["is_complex"]:
                yield {"event": "status", "data": json.dumps({"status": "🔄 Complex query detected, planning steps..."})}
                logger.info(f"Complex query detected: {complexity['reason']}")
                
                # Use multi-step executor
                async for event in self._execute_multi_step_query(query, history, include_map, session_id):
                    yield event
                return
            
            # Simple query - continue with existing flow
            # 0. Semantic Discovery (scalable pre-filter)
            yield {"event": "status", "data": json.dumps({"status": "📚 Searching data catalog..."})}            
            
            # Use semantic search to find top candidates
            candidate_tables = self.semantic_search.search_table_names(query, top_k=15)
            
            if candidate_tables:
                # Get focused summaries for LLM refinement
                candidate_summaries = self.catalog.get_summaries_for_tables(candidate_tables)
            else:
                # Fallback to all summaries (legacy behavior for small catalogs)
                candidate_summaries = self.catalog.get_all_table_summaries()
            
            # 1. LLM refines from candidates
            yield {"event": "status", "data": json.dumps({"status": "🔍 Identifying relevant tables..."})}
            relevant_tables = await self.llm.identify_relevant_tables(query, candidate_summaries)
            
            # 2. Lazy Load
            if relevant_tables:
                yield {"event": "status", "data": json.dumps({"status": f"💾 Loading tables: {', '.join(relevant_tables)}..."})}
            
            feature_tables = []
            for table in relevant_tables:
                if self.geo_engine.ensure_table_loaded(table):
                    feature_tables.append(table)
            
            # 3. Schema
            table_schema = self.geo_engine.get_table_schemas()
            
            # 4. Generate SQL (Streaming Thoughts!)
            yield {"event": "status", "data": json.dumps({"status": "✍️ Writing SQL query..."})}
            
            sql_buffer = ""
            async for chunk in self.llm.stream_analytical_sql(query, table_schema, history):
                if chunk["type"] == "thought":
                    yield {"event": "chunk", "data": json.dumps({"type": "thought", "content": chunk["text"]})}
                elif chunk["type"] == "content":
                    sql_buffer += chunk["text"]
            
            sql = sql_buffer.replace("```sql", "").replace("```", "").strip()
            
            # 5. Check for DATA_UNAVAILABLE error from LLM
            if "DATA_UNAVAILABLE" in sql or sql.startswith("-- ERROR"):
                yield {"event": "status", "data": json.dumps({"status": "ℹ️ Data not available"})}
                
                requested = "the requested data"
                available = "administrative boundaries (provinces, districts, corregimientos)"
                
                for line in sql.split("\n"):
                    if "Requested:" in line:
                        requested = line.split("Requested:")[-1].strip()
                    elif "Available:" in line:
                        available = line.split("Available:")[-1].strip()
                
                error_response = f"""I couldn't find data for **{requested}** in the current database.

**Available datasets include:**
- {available}

If you need additional data, please let me know and I can help you understand what's currently available or suggest alternative queries."""
                
                yield {
                    "event": "result",
                    "data": json.dumps({
                        "response": error_response,
                        "sql_query": sql,
                        "geojson": None,
                        "data_citations": [],
                        "chart_data": None,
                        "raw_data": []
                    })
                }
                return 
            
            # 6. Execute query
            yield {"event": "status", "data": json.dumps({"status": "⚡ Executing query..."})}
            
            geojson = None
            features = []
            error_message = None
            
            try:
                geojson = self.geo_engine.execute_spatial_query(sql)
                features = geojson.get("features", [])
                yield {"event": "status", "data": json.dumps({"status": f"✅ Found {len(features)} results"})}
            except Exception as e:
                error_message = str(e)
                yield {"event": "status", "data": json.dumps({"status": "⚠️ Query error, attempting repair..."})}
                try:
                    sql = await self.llm.correct_sql(query, sql, error_message, str(table_schema))
                    geojson = self.geo_engine.execute_spatial_query(sql)
                    features = geojson.get("features", [])
                    error_message = None
                except Exception as e2:
                    print(f"Repair failed: {e2}")

            if error_message:
                 yield {
                    "event": "result",
                    "data": json.dumps({
                        "response": f"I was unable to process your request because the data query failed. \n\nError details: {error_message}",
                        "sql_query": sql,
                        "geojson": None,
                        "data_citations": [],
                        "chart_data": None,
                        "raw_data": []
                    })
                 }
                 return

            # 7. Post-process using ResponseFormatter
            citations = ResponseFormatter.generate_citations(relevant_tables, features)
            
            # Chart
            chart_data = ResponseFormatter.generate_chart_data(sql, features)
            if intent == "STAT_QUERY" and not chart_data and features:
                 chart_data = ResponseFormatter.generate_chart_data("GROUP BY forced", features)

            # Raw Data
            raw_data = ResponseFormatter.prepare_raw_data(features)
            
            # Map Config 
            if include_map and features and geojson:
                # Generate AI layer name
                layer_info = await self.llm.generate_layer_name(query, sql)
                layer_name_ai = layer_info.get("name", "Map Layer")
                layer_emoji = layer_info.get("emoji", "📍")
                point_style = layer_info.get("pointStyle", None)
                geojson, layer_id, layer_name = ResponseFormatter.format_geojson_layer(query, geojson, features, layer_name_ai, layer_emoji, point_style)
                
                try:
                    table_name = self.geo_engine.register_layer(layer_id, geojson)
                    self.session_store.add_layer(session_id, {
                        "id": layer_id, 
                        "name": layer_name, 
                        "table_name": table_name, 
                        "timestamp": datetime.datetime.now().isoformat()
                    })
                except Exception as e:
                    logger.warning(f"Failed to register layer: {e}")

            # 8. Explanation (Streaming!)
            yield {"event": "status", "data": json.dumps({"status": "💬 Generating explanation..."})}
            
            data_summary = ResponseFormatter.generate_data_summary(features)

            explanation_buffer = ""
            
            async for chunk in self.llm.stream_explanation(query, sql, data_summary, history):
                if chunk["type"] == "thought":
                    yield {"event": "chunk", "data": json.dumps({"type": "thought", "content": chunk["text"]})}
                elif chunk["type"] == "content":
                    explanation_buffer += chunk["text"]
                    yield {"event": "chunk", "data": json.dumps({"type": "text", "content": chunk["text"]})}
            
            # 9. Final Result Event
            yield {"event": "result", "data": json.dumps({
                "response": explanation_buffer,
                "sql_query": sql,
                "geojson": geojson if include_map and features else None,
                "chart_data": chart_data,
                "raw_data": raw_data,
                "data_citations": citations
            })}
            
        elif intent == "SPATIAL_OP":
            yield {"event": "status", "data": json.dumps({"status": "📐 Preparing spatial operation..."})}
            session_id = DEFAULT_SESSION_ID  # TODO: Get from request context
            
            # 0. Semantic Discovery for base tables
            candidate_tables = self.semantic_search.search_table_names(query, top_k=15)
            if candidate_tables:
                candidate_summaries = self.catalog.get_summaries_for_tables(candidate_tables)
            else:
                candidate_summaries = self.catalog.get_all_table_summaries()
            
            # 1. Identify relevant base tables from query
            relevant_tables = await self.llm.identify_relevant_tables(query, candidate_summaries)
            
            # 2. Lazy load those tables
            for table in relevant_tables:
                self.geo_engine.ensure_table_loaded(table)
            
            # 3. Get schema of loaded base tables
            base_table_schema = self.geo_engine.get_table_schemas()
            
            # 4. Prepare Layer Context (user-created layers from session)
            session_layers = self.session_store.get_layers(session_id)
            layer_context = "User-Created Layers:\n"
            if not session_layers:
                 layer_context += "(No user layers created yet.)\n"
            else:
                 for i, layer in enumerate(session_layers):
                     layer_context += f"Layer {i+1}: {layer['name']} (Table: {layer['table_name']})\n"
            
            # 5. Combine both contexts for LLM
            full_context = f"{base_table_schema}\n\n{layer_context}"
            
            # 6. Generate Spatial SQL
            yield {"event": "status", "data": json.dumps({"status": "✍️ Writing spatial SQL..."})}
            sql = await self.llm.generate_spatial_sql(query, full_context, history)
            
            # 7. Execute
            yield {"event": "status", "data": json.dumps({"status": "⚙️ Processing geometry..."})}
            error_message = None
            geojson = None
            features = []
            
            try:
                geojson = self.geo_engine.execute_spatial_query(sql)
                features = geojson.get("features", [])
                yield {"event": "status", "data": json.dumps({"status": f"✅ Result contains {len(features)} features"})}
            except Exception as e:
                error_message = str(e)
                yield {"event": "status", "data": json.dumps({"status": "⚠️ Spatial error, attempting repair..."})}
                try:
                     sql = await self.llm.correct_sql(query, sql, error_message, full_context)
                     geojson = self.geo_engine.execute_spatial_query(sql)
                     features = geojson.get("features", [])
                     error_message = None
                except Exception as e2:
                     yield {
                        "event": "result",
                        "data": json.dumps({
                            "response": f"I tried to perform the spatial operation but encountered an error: {str(e)}\n\nQuery: {sql}",
                            "sql_query": sql,
                            "geojson": None,
                            "data_citations": [],
                            "chart_data": None,
                            "raw_data": []
                        })
                    }
                     return

            # 4. Result Processing
            if features:
                # Generate AI layer name
                layer_info = await self.llm.generate_layer_name(query, sql)
                layer_name_ai = layer_info.get("name", "Map Layer")
                layer_emoji = layer_info.get("emoji", "📍")
                point_style = layer_info.get("pointStyle", None)
                geojson, layer_id, layer_name = ResponseFormatter.format_geojson_layer(query, geojson, features, layer_name_ai, layer_emoji, point_style)
                
                try:
                    table_name = self.geo_engine.register_layer(layer_id, geojson)
                    self.session_store.add_layer(session_id, {
                        "id": layer_id, 
                        "name": layer_name, 
                        "table_name": table_name, 
                        "timestamp": datetime.datetime.now().isoformat()
                    })
                except Exception as e:
                    logger.warning(f"Failed to register layer: {e}")
                
            # 5. Explanation
            yield {"event": "status", "data": json.dumps({"status": "💬 Explaining results..."})}
            data_summary = f"Spatial operation resulted in {len(features)} features."
            
            explanation_buffer = ""
            async for chunk in self.llm.stream_explanation(query, sql, data_summary, history):
                if chunk["type"] == "thought":
                    yield {"event": "chunk", "data": json.dumps({"type": "thought", "content": chunk["text"]})}
                elif chunk["type"] == "content":
                    explanation_buffer += chunk["text"]
                    yield {"event": "chunk", "data": json.dumps({"type": "text", "content": chunk["text"]})}
            
            # 6. Final Result
            yield {"event": "result", "data": json.dumps({
                "response": explanation_buffer,
                "sql_query": sql,
                "geojson": geojson,
                "chart_data": None,
                "raw_data": [], # Spatial ops usually visual
                "data_citations": []
            })}
            return

        else:
             # Fallback
             yield {"event": "chunk", "data": json.dumps({"type": "text", "content": "I'm not sure how to handle this query yet."})}

    async def _handle_general_chat(self, query: str, history: List[Dict[str, str]]) -> Dict[str, Any]:
        """Handles general conversational queries."""
        # Add schema context to help the LLM answer questions about the data
        enhanced_query = f"""The user is asking about Panama geographic data. 
        
Available data: {len(self.data_loader.admin1)} provinces, {len(self.data_loader.admin2)} districts, {len(self.data_loader.admin3)} corregimientos.

User question: {query}

Respond helpfully as GeoQuery, the territorial intelligence assistant."""

        response = await self.llm.generate_response(enhanced_query, history)
        
        return {
            "response": response,
            "sql_query": None,
            "geojson": None,
            "data_citations": [],
            "intent": "GENERAL_CHAT"
        }

    async def _handle_data_query(self, query: str, history: List[Dict[str, str]], include_map: bool = True) -> Dict[str, Any]:
        """
        Handles data queries using text-to-SQL with SOTA Smart Discovery.
        """
        print(f"[GeoQuery] Starting Data Query: {query}")
        
        # 0. Get Catalog
        from backend.core.data_catalog import get_data_catalog
        catalog = get_data_catalog()
        
        # 1. Smart Discovery: Identify relevant tables
        summaries = catalog.get_all_table_summaries()
        
        # Ask LLM which tables are relevant
        relevant_tables = await self.llm.identify_relevant_tables(query, summaries)
        
        # 2. Lazy Loading
        feature_tables = []
        for table in relevant_tables:
            if self.geo_engine.ensure_table_loaded(table):
                feature_tables.append(table)
            else:
                print(f"[GeoQuery] Warning: Could not load relevant table '{table}'")
                
        # 3. Get schema context (now includes the newly loaded tables)
        table_schema = self.geo_engine.get_table_schemas()

        # Fallback for empty schema
        if len(table_schema) < 50: 
             print("[GeoQuery] GeoEngine schema empty. Fetching from Catalog Metadata.")
             fallback_tables = list(set(feature_tables + ["pan_admin1", "pan_admin2", "pan_admin3"]))
             table_schema = catalog.get_specific_table_schemas(fallback_tables)
        
        # 4. Generate real SQL using LLM
        print(f"[GeoQuery] Generating SQL with context size: {len(table_schema)} chars")
        sql = await self.llm.generate_analytical_sql(query, table_schema, history)
        
        # Check for SQL generation errors
        if sql.startswith("-- Error"):
            available_data = ", ".join(feature_tables) if feature_tables else "Administrative Boundaries"
            return {
                "response": f"I couldn't find the specific data you asked for. I have access to: {available_data}. \n\nOriginal request: {query}",
                "sql_query": sql,
                "intent": "DATA_QUERY"
            }
        
        # 5. Execute SQL in DuckDB
        error_message = None
        try:
            geojson = self.geo_engine.execute_spatial_query(sql)
            features = geojson.get("features", [])
            print(f"[GeoQuery] Query returned {len(features)} features")
        except Exception as e:
            error_message = str(e)
            print(f"[GeoQuery] SQL execution error: {error_message}")
            
            # Self-Correction Loop
            try:
                sql = await self.llm.correct_sql(query, sql, error_message, str(table_schema))
                geojson = self.geo_engine.execute_spatial_query(sql)
                features = geojson.get("features", [])
                error_message = None 
            except Exception as e2:
                return {
                    "response": f"The SQL query failed to execute even after an automatic repair attempt.\nOriginal Error: {error_message}\nRepair Error: {str(e2)}",
                    "sql_query": sql,
                    "intent": "DATA_QUERY"
                }
        
        # 6. Post-Process via ResponseFormatter
        citations = ResponseFormatter.generate_citations(relevant_tables, features)
        data_summary = ResponseFormatter.generate_data_summary(features)
        
        # 7. Generate explanation
        explanation = await self.llm.generate_explanation(query, sql, data_summary, history)
        
        # 8. Add Layer Metadata to GeoJSON and REGISTER in GeoEngine
        if include_map and features:
            # Generate AI layer name
            layer_info = await self.llm.generate_layer_name(query, sql)
            layer_name_ai = layer_info.get("name", "Map Layer")
            layer_emoji = layer_info.get("emoji", "📍")
            point_style = layer_info.get("pointStyle", None)
            geojson, layer_id, layer_name = ResponseFormatter.format_geojson_layer(query, geojson, features, layer_name_ai, layer_emoji, point_style)
            
            try:
                table_name = self.geo_engine.register_layer(layer_id, geojson)
                self.session_store.add_layer(DEFAULT_SESSION_ID, {
                    "id": layer_id,
                    "name": layer_name,
                    "table_name": table_name,
                    "timestamp": datetime.datetime.now().isoformat()
                })
            except Exception as e:
                logger.warning(f"Failed to register layer in GeoEngine: {e}")

        # 9. Auto-generate Chart
        chart_data = ResponseFormatter.generate_chart_data(sql, features)

        # 10. Prepare Raw Data
        raw_data = ResponseFormatter.prepare_raw_data(features)

        return {
            "response": explanation,
            "sql_query": sql,  
            "geojson": geojson if include_map and features else None,
            "data_citations": citations,
            "chart_data": chart_data,
            "raw_data": raw_data,
            "intent": "DATA_QUERY" if not include_map else "MAP_REQUEST"
        }

    async def _handle_spatial_op(self, query: str, history: List[Dict[str, str]]) -> Dict[str, Any]:
        """Handles spatial operations (Difference, Intersection, etc) using GeoEngine."""
        # 0. Get data catalog for relevant tables
        from backend.core.data_catalog import get_data_catalog
        catalog = get_data_catalog()
        summaries = catalog.get_all_table_summaries()
        
        # 1. Identify relevant base tables from query
        relevant_tables = await self.llm.identify_relevant_tables(query, summaries)
        
        # 2. Lazy load those tables
        for table in relevant_tables:
            self.geo_engine.ensure_table_loaded(table)
        
        # 3. Get schema of loaded base tables
        base_table_schema = self.geo_engine.get_table_schemas()
        
        # 4. Prepare Layer Context (user-created layers from session)
        session_layers = self.session_store.get_layers(DEFAULT_SESSION_ID)
        layer_context = "User-Created Layers:\n"
        if not session_layers:
             layer_context += "(No user layers created yet.)\n"
        else:
             for i, layer in enumerate(session_layers):
                 layer_context += f"Layer {i+1}: {layer['name']} (Table: {layer['table_name']})\n"
        
        # 5. Combine both contexts for LLM
        full_context = f"{base_table_schema}\n\n{layer_context}"
        
        # 6. Generate Spatial SQL
        sql = await self.llm.generate_spatial_sql(query, full_context, history)
        
        # 7. Execute
        error_message = None
        geojson = None
        features = []
        
        try:
            geojson = self.geo_engine.execute_spatial_query(sql)
            features = geojson.get("features", [])
        except Exception as e:
            error_message = str(e)
            try:
                 sql = await self.llm.correct_sql(query, sql, error_message, full_context)
                 geojson = self.geo_engine.execute_spatial_query(sql)
                 features = geojson.get("features", [])
                 error_message = None
            except Exception as e2:
                 return {
                    "response": f"I tried to perform the spatial operation but encountered an error: {str(e)}\n\nQuery: {sql}",
                    "sql_query": sql,
                    "intent": "SPATIAL_OP"
                }

        # 4. Result Processing
        if features:
            # Generate AI layer name
            layer_info = await self.llm.generate_layer_name(query, sql)
            layer_name_ai = layer_info.get("name", "Map Layer")
            layer_emoji = layer_info.get("emoji", "📍")
            point_style = layer_info.get("pointStyle", None)
            geojson, layer_id, layer_name = ResponseFormatter.format_geojson_layer(query, geojson, features, layer_name_ai, layer_emoji, point_style)
            table_name = self.geo_engine.register_layer(layer_id, geojson)
            self.session_store.add_layer(DEFAULT_SESSION_ID, {
                "id": layer_id, 
                "name": layer_name, 
                "table_name": table_name, 
                "timestamp": datetime.datetime.now().isoformat()
            })
            
        data_summary = f"Spatial operation resulted in {len(features)} features."
        explanation = await self.llm.generate_explanation(query, sql, data_summary, history)
        
        return {
            "response": explanation,
            "sql_query": sql,
            "geojson": geojson,
            "data_citations": [], 
            "intent": "SPATIAL_OP"
        }

    async def _handle_stat_query(self, query: str, history: List[Dict[str, str]]) -> Dict[str, Any]:
        """
        Handles statistical queries where charts/tables are more important than maps.
        """
        # Reuse data query logic but without map emphasis
        result = await self._handle_data_query(query, history, include_map=False)
        result["intent"] = "STAT_QUERY"
        
        # Ensure chart data is present if possible
        if not result.get("chart_data") and result.get("raw_data"):
             # Force chart attempt
             features_mock = [{"properties": d} for d in result["raw_data"]]
             result["chart_data"] = ResponseFormatter.generate_chart_data(result.get("sql_query", ""), features_mock)
             
        return result

    async def _execute_multi_step_query(
        self, 
        query: str, 
        history: List[Dict[str, str]], 
        include_map: bool,
        session_id: str
    ):
        """
        Execute a complex query by breaking it into multiple steps.
        
        Yields streaming events throughout the multi-step process.
        """
        import asyncio
        
        # 1. Get candidate tables for planning
        yield {"event": "status", "data": json.dumps({"status": "📚 Discovering relevant datasets..."})}
        
        candidate_tables = self.semantic_search.search_table_names(query, top_k=20)
        if not candidate_tables:
            candidate_tables = list(self.catalog.catalog.keys())
        
        # 2. Plan the query
        yield {"event": "status", "data": json.dumps({"status": "📋 Creating execution plan..."})}
        
        plan = await self.query_planner.plan_query(query, candidate_tables, self.llm)
        
        if not plan.is_complex or not plan.steps:
            # Fallback to simple execution
            yield {"event": "status", "data": json.dumps({"status": "📚 Executing as simple query..."})}
            # Re-route to simple path by manually calling the logic
            candidate_summaries = self.catalog.get_summaries_for_tables(candidate_tables)
            relevant_tables = await self.llm.identify_relevant_tables(query, candidate_summaries)
            
            for table in relevant_tables:
                self.geo_engine.ensure_table_loaded(table)
            
            table_schema = self.geo_engine.get_table_schemas()
            
            yield {"event": "status", "data": json.dumps({"status": "✍️ Writing SQL query..."})}
            sql = await self.llm.generate_analytical_sql(query, table_schema, history)
            sql = sql.replace("```sql", "").replace("```", "").strip()
            
            try:
                geojson = self.geo_engine.execute_spatial_query(sql)
                features = geojson.get("features", [])
            except Exception as e:
                yield {"event": "result", "data": json.dumps({
                    "response": f"Query execution failed: {str(e)}",
                    "sql_query": sql
                })}
                return
            
            data_summary = ResponseFormatter.generate_data_summary(features)
            explanation = await self.llm.generate_explanation(query, sql, data_summary, history)
            
            yield {"event": "result", "data": json.dumps({
                "response": explanation,
                "sql_query": sql,
                "geojson": geojson if include_map and features else None,
                "chart_data": ResponseFormatter.generate_chart_data(sql, features),
                "raw_data": ResponseFormatter.prepare_raw_data(features),
                "data_citations": []
            })}
            return
        
        # 3. Show plan to user
        step_descriptions = [f"Step {i+1}: {s.description}" for i, s in enumerate(plan.steps)]
        yield {"event": "chunk", "data": json.dumps({
            "type": "thought", 
            "content": f"Planning multi-step execution:\n" + "\n".join(step_descriptions)
        })}
        
        # 4. Load all needed tables
        all_tables = set()
        for step in plan.steps:
            all_tables.update(step.tables_needed)
        
        if all_tables:
            yield {"event": "status", "data": json.dumps({"status": f"💾 Loading {len(all_tables)} datasets..."})}
            for table in all_tables:
                self.geo_engine.ensure_table_loaded(table)
        
        # 5. Execute steps by parallel groups
        intermediate_results = {}
        all_features = []
        all_sql = []
        
        for group_idx, group in enumerate(plan.parallel_groups):
            group_steps = [s for s in plan.steps if s.step_id in group]
            
            yield {"event": "status", "data": json.dumps({
                "status": f"⚡ Executing step group {group_idx + 1}/{len(plan.parallel_groups)}..."
            })}
            
            # Execute steps in this group (could be parallel, but sequential for simplicity)
            for step in group_steps:
                yield {"event": "status", "data": json.dumps({
                    "status": f"🔄 {step.description}..."
                })}
                
                # Generate SQL for this step
                table_schema = self.geo_engine.get_table_schemas()
                
                # Build step-specific prompt
                step_query = f"""Execute this step: {step.description}

Original user request: {query}

SQL Hint: {step.sql_template or 'None'}

Previous step results available: {list(intermediate_results.keys())}"""
                
                sql = await self.llm.generate_analytical_sql(step_query, table_schema, history)
                sql = sql.replace("```sql", "").replace("```", "").strip()
                
                # Skip if LLM returned an error
                if "DATA_UNAVAILABLE" in sql or sql.startswith("-- ERROR"):
                    logger.warning(f"Step {step.step_id} indicated data unavailable")
                    intermediate_results[step.result_name] = {"features": [], "sql": sql}
                    continue
                
                try:
                    geojson = self.geo_engine.execute_spatial_query(sql)
                    features = geojson.get("features", [])
                    
                    intermediate_results[step.result_name] = {
                        "features": features,
                        "sql": sql,
                        "geojson": geojson
                    }
                    all_features.extend(features)
                    all_sql.append(f"-- {step.description}\n{sql}")
                    
                    yield {"event": "status", "data": json.dumps({
                        "status": f"✅ Step got {len(features)} results"
                    })}
                    
                except Exception as e:
                    logger.error(f"Step {step.step_id} failed: {e}")
                    # Try to repair
                    try:
                        sql = await self.llm.correct_sql(step_query, sql, str(e), table_schema)
                        geojson = self.geo_engine.execute_spatial_query(sql)
                        features = geojson.get("features", [])
                        intermediate_results[step.result_name] = {
                            "features": features,
                            "sql": sql,
                            "geojson": geojson
                        }
                        all_features.extend(features)
                        all_sql.append(f"-- {step.description} (repaired)\n{sql}")
                    except Exception as e2:
                        logger.error(f"Step repair also failed: {e2}")
                        intermediate_results[step.result_name] = {"features": [], "sql": sql, "error": str(e2)}
        
        # 6. Generate final combined result
        yield {"event": "status", "data": json.dumps({"status": "💬 Generating combined analysis..."})}
        
        # Summarize intermediate results for explanation
        result_summary = []
        for name, result in intermediate_results.items():
            features = result.get("features", [])
            result_summary.append(f"{name}: {len(features)} records")
        
        combined_summary = f"""Multi-step query completed with {len(plan.steps)} steps.

Results:
{chr(10).join(result_summary)}

Combination logic: {plan.final_combination_logic}"""
        
        # Get combined explanation
        explanation_buffer = ""
        async for chunk in self.llm.stream_explanation(query, "\n\n".join(all_sql), combined_summary, history):
            if chunk["type"] == "content":
                explanation_buffer += chunk["text"]
                yield {"event": "chunk", "data": json.dumps({"type": "text", "content": chunk["text"]})}
        
        # Find the best geojson to display (use the one with most features)
        best_geojson = None
        best_features = []
        for name, result in intermediate_results.items():
            features = result.get("features", [])
            if len(features) > len(best_features):
                best_features = features
                best_geojson = result.get("geojson")
        
        # Generate layer if we have features
        if include_map and best_features and best_geojson:
            layer_info = await self.llm.generate_layer_name(query, all_sql[0] if all_sql else "")
            layer_name_ai = layer_info.get("name", "Multi-Step Result")
            layer_emoji = layer_info.get("emoji", "📊")
            best_geojson, layer_id, layer_name = ResponseFormatter.format_geojson_layer(
                query, best_geojson, best_features, layer_name_ai, layer_emoji
            )
            
            try:
                table_name = self.geo_engine.register_layer(layer_id, best_geojson)
                self.session_store.add_layer(session_id, {
                    "id": layer_id,
                    "name": layer_name,
                    "table_name": table_name,
                    "timestamp": datetime.datetime.now().isoformat()
                })
            except Exception as e:
                logger.warning(f"Failed to register multi-step layer: {e}")
        
        # Generate chart from combined results
        chart_data = ResponseFormatter.generate_chart_data("\n".join(all_sql), best_features)
        raw_data = ResponseFormatter.prepare_raw_data(best_features)
        
        # Final result
        yield {"event": "result", "data": json.dumps({
            "response": explanation_buffer,
            "sql_query": "\n\n".join(all_sql),
            "geojson": best_geojson if include_map and best_features else None,
            "chart_data": chart_data,
            "raw_data": raw_data,
            "data_citations": [],
            "multi_step": True,
            "steps_executed": len(plan.steps)
        })}